[PATCH] D108567: Implement #pragma clang final extension

[Stephan Bergmann via Phabricator via cfe-commits]

sberg added a comment.

> Final macros will always warn on redefinition, including situations with identical bodies and in system headers.

But

  #define NULL syntax error
  #pragma clang final(NULL)
  #include <stddef.h>
  void * p = NULL;

does not produce any warnings/errors for me and indicates that NULL silently gets redefined as a null pointer constant in stddef.h.  Is that intended?


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https://reviews.llvm.org/D108567